Restlessness, excitement, nervousness, paraesthesias, dizziness, tinnitus, blurred vision, nausea & vomiting, numbness of tongue, lightheadedness followed by sedation, excitation (transient or followed by depression w/ drowsiness, resp failure & coma); hypotension, bradycardia, arrhythmias & possible cardiac arrest; allergic reactions (cutaneous lesions, urticaria, edema or anaphylactoid reaction).